Parameter inversion method and device for formation water reservoir with medium and low salinity

Abstract

The invention provides a parameter inversion method and device of a medium-low-mineralization-degree formation water storage layer. The method comprises the steps that dual-lateral logging information, array sensing logging information and auxiliary logging curve information are obtained; according to the dual-lateral logging information and the auxiliary logging curve information, a storage layer section is subjected to layering; according to a dual-lateral logging curve and an array sensing curve, the initial original stratum resistivity, the invaded zone resistivity and the invading radius value of a corresponding layer are generated; a dual-lateral simulation response curve of the corresponding layer and an array sensing simulation response curve are generated; whether the dual-lateral simulation response curve of the corresponding layer and a dual-lateral measured curve of the corresponding layer are in accordance and whether the array sensing simulation response curve and an array sensing original response curve of the corresponding layer are in accordance are judged respectively, if yes, the original stratum resistivity, the invaded zone resistivity and the invading radius value are output as the inversion results of a storage layer section; and otherwise, the initial original stratum resistivity, the invaded zone resistivity and the invading radius value are modified.

Description

technical field [0001] The invention relates to the field of petroleum logging, in particular to a technology for inversion of formation parameters by using logging data, in particular to a parameter inversion method and device for formation water reservoirs with medium and low salinity. Background technique [0002] In the reservoir section, due to the influence of mud invasion, wellbore, surrounding rock, etc., the measured dual lateral and array induced resistivity deviate from the true resistivity, thus reducing the ability to identify oil and water layers through the resistivity curve. The calculated oil saturation has a large error. Therefore, it is necessary to use the inversion method to restore the real formation surface. [0003] Traditional inversion methods have been difficult to be practical because they are all purely mathematical methods, as long as the error between the simulated logging curve and the measured curve is less than a given ε, regardless of the ...

AI Technical Summary

Problems solved by technology

Since the induction logging has an obvious response to the low-resistivity reservoirs of the water layer, but not to the high-resistivity reservoirs of the oil and gas types, the inversion effect of the reservoir parameters by simply using the array induction logging data is limited.

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